Titanium alloy



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ALVAH W. CLEMENT, OI EAE'I CLEVELAND, OHIO, ABSIGNOE TO THE CLEVELAND EEASS MANUFACTURING COMPANY, OI CLEVELAND, OHIO, A CORPORATION OI OHIO.

No Drawing.

To all whom it may concern Be it known that I, ALVAH W. CLEMENT, a citizen of the United States, residing at East Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certaln new and useful Improvement in Titanium Alloys, of which the following is a full, clear, and exact description.

This invention relates to an alloy which may be used for the fabrication of articles and devices which in their use are subjected to the action of corroding gases and high temperatures, and the alloy is also useful as a metal for the making of dies for die castings, ball races for ball bearings, and other articles which require durability and great wearing qualities, and in the case of molds and dies, when used in connection with the molding and casting of molten substances which are corroding in character. The alloy also finds usefulness as an electrical resistance element;

The alloy comprises a combination of iron, chromium, titanium and molybdenum, to which, if desired, small quantities of aluminum or silicon or both may be added, these being added for the purpose of preventing any oxidation of the surfaces of an article fabricated from the alloy.

It is desirable to maintain the carbon content of the final alloy as low as possible, taking into consideration the use to which the alloy is to be put, by the use of so-called oxidizing slags which are free from carbon in the making of the alloy, for the presence of carbon in appreciable amounts renders the alloy difficult to work.

The molybdenum when added to the alloy tends to soften the alloy and imparts to it the property of easy machinability. The quantity of molybdenum to be added will be dependent upon the use to which the alloy is to be put, and with this consideration in mind, the amounts of molybdenum used will bear a relationship to the proportion of carbides which it is desired to have present in the final alloy, increased quantities of molybdenum preventing the combination of carbon with the iron, chromium and titanium,

A very effective alloy I have found to consist of titanium in proportion from 5 to 10 to 12 per cent, chromium in proportlon from 10 to 30 per cent, molybdenum in proportion from 3 to 5 per cent.

An alloy consisting of titanium, 6 to 10 TITANIUM AIIEOY.

Application filed December 1%, W17. serial No. 207,752.

per cent, chromium, 10 per cent, molybdenum, 3 to 5 per cent, balance, iron, will give very good results.

The alloy ma be prepared in a variety of ways. I pre er, however, to prepare the alloy in an electric furnace by melting together a ferro chrome of suitable composition, and adding to the molten bath at the proper time, a suitable amount of titanium either in its metallic form or in some combined form. Of course, the usual fluxes will be usedto purify the metal.

The aluminum and silicon may be added in their metallic form, or introdced in any other form, by providing for the use of the necessary substances to reduce them to their metallic form in the furnace for the purpose of alloying.

The alloy herein described is particularly useful in the making of annealing and carbonizing boxes or saggers which are used under conditions involving high temperatures, also for crucibles for melting brass, bronzes, etc., also as parts of furnaces, or, in fact, in any substance where it is desired to produce a structure which is resistant to heat, particularly to great heat.

Inasmuch as the alloy is non-warping, even at high temperatures, it is possible to construct articles of this alloy, which articles have thin walls, and generally the quantity of metal required in forming articles which are to have the desired characteristics, is much less than with many other metals because of the non-warpin inherent property of the alloy. This there fore enables the use of light weight structures.

The alloy may be very advantageously used for the making of dies for die castings, or for dies and plungers in the handling of hot glass, or for molds in the handling of hot glass, under which circumstances the alloy not only is resistant to wear, but is resistant to the corroding effects of the molten glass. The alloy is very useful for forming ball bearings, and when so used, the article is fabricated of the alloy as described, and subsequently the surfaces which are to be exposed to the wear and abrasion are sub-' III Having described my invention, what I claim is:

principally of iron together with an appreciable amount of molybdenum.

3. An alloy containing titanium in proportion from 5 to 25 per cent, chromium in proportion from 10 to 30 per cent, together with iron and an appreciable amount of molybdenum.

4. An alloy containing titanium from 5 to 25 per cent chromium from l0 to 30 per cent, molybdenum from 3 to 5 per cent, together with iron.

In testimony whereof, I hereunto affix my signature.

ALVAH W. CLEMENT. 

